Reflect and act as go-between? About time (8)
I believe the answer is:
meditate
'reflect' is the definition.
(synonyms)
'act as go-between? about time' is the wordplay.
'act as go-between?' becomes 'mediate' (I've seen this before).
'about' is an insertion indicator.
'time' becomes 't' (abbreviation).
'mediate' placed around 't' is 'MEDITATE'.
'and' is the link.
(Other definitions for meditate that I've seen before include "Focus one's mind for a period for spirituality or relaxation" , "Consider thoughtfully" , "Spend time in thought" , "Cogitate" , "Think intently and at length" .)